Crassispira unicolor, common name the uniformly coloured pleurotoma, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.

(Original description) The rather thick shell is oblong, pyramidal and pale brownish black.

The whorls are smooth, encircled with a single row of granules near the suture, longitudinally ribbed below.

The siphonal canal is very short.

[2] This species occurs in the Pacific Ocean off Panama.